"answer" is a singular countable noun, so it always needs an article or other determiner (with the possible exception of special idiomatic patterns, though I can't think of any offhand).
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
GPYwith the possible exception of special idiomatic patternsAs
CalifJimIn answer to your question,Oh yes, thanks, that's a good example.
Nakool Could you please give some examples where we can use 'the answer'?What's the answer?